Each day, students complete a Warmup that usually consists of spiraling the previous day's material, in addition to older material. Warm-up problems also sometimes extend lessons that students have encountered before to more unfamiliar contexts.

For a video narrative about how I structure each lesson, and how the warm-up fits in, click here.

In this case, the warm-up not only gets kids to practice finding slope, it brings back graphing of special cases -- the horizontal (y = a) and vertical (x = a) lines. I find that kids need a lot of practice seeing these over the course of several days to beomce fluent in this.